Desquamation is one of the ways that dolphins are able to swim as quickly as they do. As dolphins swim, their skin peels off in the water, to the tune of being completely replaced every two hours worth of swimming time.

Which is kinda gross, if you think about it.

But it's also a very good way to decrease drag. The dolphin's skin is very soft, with a microscopically wavy texture that allows it to both peel off easily and distribute the jetties (officially called "vortices") further away from the dolphin's path, thus mitigating much of the drag.